Malik R, Freilinger T, Winsvold BS, Anttila V, Heiden JVander, Traylor M, de Vries B, Holliday EG, Terwindt GM, Sturm J, et al. Shared genetic basis for migraine and ischemic stroke: A genome-wide analysis of common variants. Neurology. 2015 ;84(21):2132-45.